Răspunsuri

2014-03-17T21:07:09+02:00
A) 25 =5a 
a=5
b)8+3+7=a+a+a+a-a-a(se reduc)
si iti da 2a =18
a=9
c)6+9+4+2=a+a+a+a+a-a-a(se reduc)
si iti da 21=3a de unde a =7
2014-03-17T21:09:31+02:00
A) 25=5a
5a=25
a=25/5=>a=5
b)18+2a=4a
2a-4a=-18
-2a=-18
a=18/2=>a=9
c)21+2a=5a
2a-5a=-21
-3a=-21
a=21/2=>a=7
a) 25 =5a
a=5
b)8+3+7=a+a+a+a-a-a(se reduc)
si iti da 2a =18
a=9
c)6+9+4+2=a+a+a+a+a-a-a(se reduc)
si iti da 21=3a de unde a =7
a) 25=5a
5a=25
a=25/5=>a=5
b)18+2a=4a
2a-4a=-18
-2a=-18
a=18/2=>a=9
c)21+2a=5a
2a-5a=-21
-3a=-21
a=21/2=>a=7
sper ca team ajutatt dai multumesc